24. Increased risk of embolization (non-stented and non-calcified valve). Specific Criteria for Registry 5 (NR5) and Registry 6 (NR6) Inclusion: Same criteria as Cohort B including non-femoral access Exclusion: Same criteria as Cohort B except "Native aortic annulus size <18mm or >27mm as measured by echocardiogram and exclusionary criteria #15 only excludes patients with renal insufficiency (creatinine> 3.0 mg/dL).